Accelerator for air-brakes.



J; DE LIPKOWSKI.

AGCELERATOB. FOR AIR BRAKES.

APPLICATION FILED JUNI; zo, 191s.

1,083,891, Patented Jan.6,1914.

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HHB amlfHHUH N I I t @umn I WITNE'S ES v/VENTO? JOSEPH DE LIPKOWSKI, OF PARIS, FRANCE.

ACCELERATOR FOR AIR-BRAKES.

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Original application lled December 13, 1911, Serial No. 665,552.

1913. Serial To all whom it may concern.'

Be it known that l, Josnrrr Dn Lirnowsii, a subject of the Emperor of l-tussia, and a resident ei Paris, France, have invented a certain new and improved Accelerator for Air-Brakes, of which the following is a speciiication.

The present invention relates to accelerators for air brakes and particularly to brakes of the type disclosed in my copending application Serial Number 665,552 of which the present application is a division.

The object of my invention is to provide a simple and efficient accelerator of this type, having the characteristics hereinafter pointed out.

ln the accompanying drawing, Figure l is a longitudinal section through an accelerator in which my invention is embodied in one term; Fig. 2 is a similar view of a modified construction provided with a cuttingout cock; Figs. 3 to 6 are sections through this cock showing its position respectively, when operating the brake without the accelerator, when cutting out brake and accelerator, when operating the brake with the accelerator, when operating the accelerator with the brake cut out.

rlhe present accelerator in the form here shown comprises a valve L held to its seat by a spring M and mounted on the end of a spindle carrying, spaced apart, the two pistons P1, P2, which slide in their respective guide ways in the casing. Two diaphragms L1, L2, of unequal diameter, are also carried by the valve stem, and the smaller diaphragm L2, which is exposed to atmospheric pressure, is of such size that it balances the atmospheric pressure upon the lower face of the valve L. rll`he compressed air from the pipe N, N, passes through the piston P1 by way of the small orifice p, and fills the space O located between the two pistons and forming a pressure reservoir. inasmuch as both piston P2 and valve L are subject to atmospheric pressure on their outer faces and to the pressure of the air of the train pipe on their inner faces, the apparatus is normally in equilibrium.

lVhen the driver applies the air brake gradually in the ordinary way, the ifall of pressure produced in the train pipe is slight and gradual enough 'for the compressed air inclosed between the two pistons P1 and P2 to pass into the train-pipe through the orifice Specification of Letters Patent.

Patented dan. i914.

Divided and this application filed .Tune 20, No. 774,834.

j) without moving the piston P1. But in the case of a sudden or emergency stoppage, the lall of pressure produced in the train-pipe by the driver is so rapid that the air in the accelerator reservoir O on the first carriage cannot at once establish equilibrium on both sides ot the diaphragm L1 through the oritice p. rlhe piston P1 is, therefore, moved downward, the valve L is opened quickly and the train pipe thus emptied. The great tall ofpressure thus made in the train pipe spreads almost instantly from one accelerator to the other and the action ot' the brakes is rendered extremely rapid. After the accelerated braking the valve L of the accelerator closes again under the action oi the spring M and the accelerator no longer influences the usual gradual braking action.

in order to cut out the accelerator there is provided a small bolt or key (not shown on the drawings) which allows the valve L to be locked.

rlhe accelerator can be fitted, To a wagon, not braked, but simply supplied with a train-pipe. (2.) To a braked wagon by placing the accelerator on the trainpipe. (3.) To a braked wagon by fixing the accelerator directly on the air distributor. In this ease the accelerator is supplied with a union or coupling which is fixed on a similar union on the distributer.

The modification of the accelerator shown in Fig. 2 differs from the preceding form only by the addition of a special cut-out cock. The action of this accelerator is the same as that which has just been described.

The cut-eut cock can assume any one ofi' the four positions shown in Figs. 3, 4, 5 and 6. ln the position shown in Fig. 3, the cock connects the train-pipe N with the pipe N1 leading to the distributer. In the position shown in Fig. 4t, the brake and the accelerator are completely cut-ofi' from the train pipe N. In the position shown in Fig. 5, the brake and the accelerator are both operatively connected to the train-pipe. rlhese three positions are the same as in the lVestinghouse brake. In the position shown in l? ig. G the accelerator alone is operative and the brake is cut out. This position, which is not found in any other brake arrangement, has the great advantage oi, retaining the accelerator in case damage to the brake or valve gear necessitates cutting out the brake.

The two diaphragms of the accelerator are mounted on malleable iron pistons separately secured on the central stem, each by a single nut. This permits each piston to be taken o' separately for inspection or replacement, without dismounting the whole apparatus.

I claim as my invention l. An accelerator for compressed air brakes, comprising an accelerator Valve opening to atmosphere and a stem therefor, pistons spaced apart on said stem, diaphragme of different diameter carried by said pistons, the smaller diaphragm being exposed on one side to atmosphere and being of a size to equalize the atmospheric pressure on one face of the accelerator valve.

2. An accelerator for compressed air brakes, comprising an accelerator Valve opening to atmosphere and a stem therefor, independent pistons spaced apart on said stem, diaphragms of diderent diameter carried by said pistons and each mounted thereon by a single nut, the smaller diaphragm being exposed to air pressure and being of a size to equalize the atmospheric pressure on one face of the accelerator valve.

In testimony whereof l have signed my name to this specification, in the presence of two subscribing witnesses.

JOSEPH DE LIPKOVSK.

lVitnesses FR. TREWBICKIN, ANDRY KNCURY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

